高压汽包炉水冷壁爆管原因分析
ANALYSES OF WATER-WALL TUBE FAILURE FOR A HIGH-PRESSURE DRUM BOILER
摘 要
通过爆口试件的金相分析、垢样扫描电镜及能谱分析和X射线衍射分析,结合对实际运行状况的调查,确定水冷壁爆管损坏的原因是由于排污不畅和停用腐蚀导致的介质浓缩下的碱腐蚀.针对碱腐蚀的主要原因,提出了相应的处理措施.
腐蚀
锅炉
爆管
介质浓缩
Failure analysis
Corrosion
Drum boiler
Tube failure
Medium concentration
Abstract
The microstructure,crack mode,morphology of the brittle fracture and scale of the damaged water-wall in a high-pressure drum boiler were studied.The composition of the corrosion product was investigated by using X-ray diffraction,scanning microscopy(SEM) and electric energy spectrum as well as chemical analysis.It is believed that the damage of the tubes was caused by hydrogen damage.The superfluous non-captive hydroxyl in boiler water which greatly concentrated under scales and deposits of the tubes due to the bad blowdown system and condenser leakage was the root cause for the damage.Theoretical analysis and investigation on the boiler actual operation and the cycle chemistry supervision confirmed that the main reason of the waterwall tube failure was caustic corrosion.Some improvement measures were put forward.
中图分类号 TG172.6
所属栏目 失效分析
基金项目
收稿日期 2005/11/1
修改稿日期 2006/2/8
网络出版日期
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引用该论文: FENG Bin,HE Tie-xiang,WAN Ke-yang. ANALYSES OF WATER-WALL TUBE FAILURE FOR A HIGH-PRESSURE DRUM BOILER[J]. Corrosion & Protection, 2006, 27(9): 480～484
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参考文献
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【2】肖作善,王蒙聚,等.热力发电厂水处理(下)[M].北京:中国电力出版社,1996.472-478.
【3】湖南省电机工程学会编.火力发电厂锅炉受热面失效分析与防护[M].北京:中国电力出版社,2004.68-79.
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